We discussed this scenario quite several times this week at the ISE tradeshow in Amsterdam. If you have a hardware + some kind of middleware than transform the USB signal into TUIO, including the objoects inputs, then you can use the samples in this article.
If you don’t, you could think about manually counting the points / tracking the object but it could quickly become into a nightmare with non guaranteed results.

Check this post for more information about IntuiFace & Tangible objects.